Q. Discuss following network protocols, briefly:

(i) HTTP

(ii) FTP

(iii) SCP

(iv) SSH

(v) POP

(vi) IMAP

(vii) SMTP

(viii) VoIP

(ix) NFC

Answer =

(i) HTTP:- The HTTP (Hypertext Transfer Protocol) protocol consists of two fairly distinct items: the set of requests from browsers to servers and the set of responses going back to the other way.

(ii) FTP:- FTP (File Transfer Protocol) is a standard for the exchange of files across Internet.

(iii) SCP:- The Secure Copy Protocol or “SCP” helps to transfer computer files securely from a local to a remote host. It is somewhat similar to the File Transfer Protocol “FTP”, but it adds security and authentication.

(iv) SSH:- SSH or Secure Shell is a cryptographic network protocol for operating network services securely over an unsecured network.

(v) POP:- POP3, i.e., the Post Office Protocol version 3 has become a standard mail protocol. The POP3 defines the rules about receiving emails from a remote server to a local email client. It also makes it possible for the users to download their received email messages onto their local computer so that they can read them even when they are not connected to the Internet (offline reading). POP3 protocol is suitable if you are accessing your emails using a single application or from a single location.

(vi) IMAP:- The Internet Message Access Protocol (IMAP) is another mail protocol used in conjunction with POP3 protocol for accessing emails on a remote web server and downloads them to a local client.

(vii) SMTP:- The SMTP (Simple Mail Transfer Protocol) is used for sending emails across the Internet.

(viii) VoIP:- VolP (Voice over Internet Protocol) is a technology that enables voice communications over the Internet through the compression of voice into data packets that can be efficiently transmitted over data networks and then converted back into voice at the other end.

(ix) NFC:- NFC (Near Field Communications)  protocol is used to provide short-range wireless connectivity between two electronic devices that within the distance of 4-5 centimeters.

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